 |
Midsize cane toads lure younger cane toads, which the bigger toads then swallow
whole. A mother caecilian, top right, stays by her young and literally feeds them
her self. Tamarin monkeys don't eat their offspring, except when they do.
The female redback spider makes a meal of her mates.
|
When Richard Shine,
a biologist at the University of Sydney in Australia, first heard the mystery
of the missing eggs, he feared it was another case of what might be called
invasive toadkill. He and his colleagues were studying the cane toad, Rhinella
marina, a big, warty, sludge-colored Latin American amphibian that was brought
to the continent years ago in an ill-fated effort at beetle control.
The researchers already knew that many large Australian carnivores
like freshwater crocodiles and marsupial quolls had died after naïvely feasting
on the highly toxic adult toads. Now it seemed that smaller predators were
going after the toad’s equally poisonous eggs, and Dr. Shine worried that they
too would be doomed.
Follow-up field studies soon revealed the identity of the caviar
thieves. To the researchers’ astonishment, Dr. Shine said, it was cane toads
themselves — or rather their tadpoles, which would swim over to each fresh
batch of Rhinella eggs and “desperately consume” every slick black spherelet
they could find.
Significantly, the tadpoles weren’t simply hungry for a generic
omelette. Reporting in the journal Animal Behaviour, Dr. Shine and his
co-workers showed that when given a choice between cane toad eggs and the
similar-looking egg masses of other frog species, Rhinella tadpoles overwhelmingly picked the cannibal
option. Oh, little cane toads lacking legs, how greedily you snack
on pre-toads packed in eggs!
Life after metamorphosis brought scant relief from fraternal threats.
The scientists also demonstrated that midsize cane toads
wriggle digits on their hind feet to lure younger cane toads, which the bigger
toads then swallow whole. “A cane toad’s biggest enemy is another cane toad,”
Dr. Shine said. “It’s a toad-eat-toad world out there.”
Rhinella’s brutal appetite is among a string of recent revelations of
what might be called extreme or uncanny cannibalism, when one animal’s
determination to feed on its fellows takes such a florid or subversive turn
that scientists are left, as Mark Wilkinson of the Natural History Museum in
London put it, “gobsmacked” by the sight.
There are males that demand to be cannibalized by their lovers and
males that seek to avoid that fate by stopping midcourtship and hammily
feigning rigor mortis. There are mother monkeys that act like hipster zombies,
greeting unwanted offspring with a ghoulish demand for brains; and there are
infant caecilians — limbless, soil-dwelling amphibians — that grow fat by
repeatedly skinning their mother alive.
In the past, animal cannibalism was considered accidental or
pathological: Walk in on a mother rabbit giving birth, and the shock will prod
her to eat her bunnies. Now scientists realize that cannibalism can sometimes
make good evolutionary sense, and for each new example they seek to trace the
selective forces behind it.
Why do cane toad tadpoles cannibalize eggs? Researchers propose three
motives. The practice speeds up maturation; it eliminates future rivals who,
given a mother toad’s reproductive cycle, are almost certainly unrelated to
you; and it means exploiting an abundant resource that others find toxic but to
which you are immune.
“We’re talking about a tropical animal that was relocated to one of
the driest places on earth,” Dr. Shine said. “Cannibalism is one of those
clever tricks that makes it such a superb colonizer and a survival machine.”
Maydianne Andrade, a biologist at the University of Toronto
Scarborough in Ontario, has studied the redback spider, a type of black widow
in which males willingly fling themselves onto the fangs of their much bigger
mates. Dr. Andrade has found that the self-sacrificial act is simply the
grand finale of an elaborate Ringling Brothers courtship performance
that can last hours.
The suitor leaps around the web to vibrate its silken strands just so.
He vaults up and over the female, back to front, side to side, again and again.
He somersaults tantalizingly close to her mouth and then flips himself clear.
Is she ready to mate? She allows the male to mount her and fill one of
her paired sperm storage organs, but then, hold on buster, it’s time for more
jitterbugging, more lordly leaping. The male dances around her jaws again, she
lets him fill sperm receptacle No. 2, his genitals break off to help seal the
deal, and that’s it. He somersaults toward her fangs for real, she makes a
quick meal of him, and he dies in arachnirvana, his gametes well positioned to
sire thousands of next-generation redbacks.
But
woe to any suitor that lacks a daredevil stripe. The female will cut short his
wan routine, cannibalize him prematurely and then instantly mate with a rival,
as if out of spite.
Dr. Andrade said
the male redback’s suicidal efforts made sense. Males are the size of rice
grains and blown about by the wind, females are spottily distributed and hard
to find, and a vast majority of males never encounter a single female. For the
lucky few who do, there’s no time to waste: This is their one shot at legacy,
and they throw their hearts and parts in her hands.
“It’s what we call a terminal
investment,” Dr. Andrade said.
For males with better dating prospects than the redback, the idea of
connubial cannibalism may not seem so sexy, and the males do what they can to
keep peckish females at bay. Among some species of widow spiders, males are preferentially drawn to females that smell as
if they’ve just finished dinner, and hence are less likely to view
approaching mate as a meal.
Studying Pisaura mirabilis, a slender, half-inch-long brown garden
spider found in Denmark, Trine Bilde of Aarhus University and her colleagues
have discovered that the males sometimes resort to a particularly melodramatic
anticannibalism gambit. A male woos a female with a nuptial gift, a
fresh-caught insect neatly bundled in silk and held aloft in his fangs. The
female latches onto the gift with her fangs, and if she starts eating it
calmly, the male slowly positions himself around her and starts transferring
sperm.
If, however, the female grabs the parcel a little too hungrily, the male counters the predatory threat by playing spider
possum. “He’s still holding onto the gift, but he stretches himself
out into a deathlike pose, completely motionless, with his legs lagging
behind,” Dr. Bilde said.
The female starts running around with the gift, the limp male dangling
from it. Only when she finally grows tranquil enough to treat her present with
care will the male dare to rouse himself back to life and lovemaking.
“This sort of death-feigning behavior has never been observed before
in a sexual context,” Dr. Bilde said. “It’s very spectacular to see.”
Another skin-tingling spectacle is the kind of living cannibalism
recently identified in two species of caecilians. These limbless tropical
amphibians may live in soil and look like worms, but the mothers act like
saints. For some three months after her young have hatched, the mother stays by
their side, and repeatedly, literally feeds them herself.
Over a three-day period, the outer layer of the female’s skin
gradually swells with lipids and turns pale and glisteny. When
moment and maternal epidermis are ripe, a half-dozen famished young caecilians
surround her, and using rows of temporary, specialized teeth that look like
slotted spoons or grappling hooks, they peel her, potato-style, from top to
tail. They tug and yank. They fight over hanks.
“Within 10 minutes of fairly frenzied activity, they have peeled all
the mother’s skin off,” said Dr. Wilkinson of the Natural History Museum, who
with his colleagues reported on skin-feeding behavior in the journals Nature and Biology Letters. Mother Caecilia doesn’t seem
to mind. Like a lactating Madonna, “she remains placid the whole time,” Dr.
Wilkinson said.
Not all mothers are martyrs, of course, and even the good ones may
have their monstrous moments. Tamarin monkeys are normally famed for
extravagant devotion to their offspring, but in a recent issue of the journal
Primates, Laurence Culot, now of São Paulo State University in Brazil, and her
colleagues described witnessing a rare case of maternal cannibalism
among wild mustached tamarins of Peru.
A mother tamarin holding her infant son was foraging for fruit with
her adult daughter. One moment the charming tableau looked fine, baby monkey
clinging adorably to mother’s fur. The next, the researchers watched as the
mother bit through the baby’s skull and ate out its brain. And once the mother
had polished off the entire head, her adult daughter partook of some shoulder.
“I was really, really surprised — it was a totally unexpected thing to
see among wild tamarins,” Dr. Culot said. “I couldn’t help thinking, ‘Oh, my
God, I forgot my camera!’ ”
The researchers propose that, in a way, the grisly act was an
expression of maternal love. The adult daughter turned out to be pregnant at
the time. Tamarin infants are so demanding that rearing them is a group affair,
and if the mother’s infant survived, the daughter’s wouldn’t have a chance.
Through a shared act of cannibalism, mother and daughter made their pact.
No comments:
Post a Comment